1106.2318 (A. A. Kordyuk et al.)

Anomalously enhanced photoemission from the Dirac point and symmetry of
the self-energy variations for the surface states in Bi2Se3    [PDF]

A. A. Kordyuk, V. B. Zabolotnyy, D. V. Evtushinsky, T. K. Kim, B. Buechner, I. V. Plyushchay, H. Berger, S. V. Borisenko

Accurate analysis of the photoemission intensity from the surface states of
Bi2Se3 reveals two unusual features: spectral line asymmetry and anomalously
enhanced photoemission from the Dirac point. The former indicates a certain
symmetry of a scattering process, which results in strongly k\omega-dependent
contribution to the imaginary part of the self-energy that changes sign while
crossing both the dispersion curves and the energy of the Dirac point. The
latter is hard to describe by one particle spectral function while a final
state interference seems to be plausible explanation.

View original: http://arxiv.org/abs/1106.2318